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An object such as a metal coil or air-filled tube which provides a force opposing the direction of deformation.

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Particles connected with spring, sliding over lines. Question about the potential energy

The particles experience gravity and are connected by an ideal spring with natural length $l$ and a spring constant $k = \frac{\sqrt{3} mg}{l} $. … sqrt{\frac{k}{2m}}$ and $\omega_2 = \sqrt{\frac{3k}{4m}}$ To find the equillibrium position I calculated the potential energy $V$, both gravity and the elastic forces acting on the particle due to the spring
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